AL 3 (BH 261)
Globular Cluster AL 3 (BH 261),
Discovered by Andrews and Lindsay (1967),
cataloged by Van den Bergh and Hagen (1975),
identified as globular cluster by Ortolani, Bica and Barbuy (2005).
- Distance from Sun:
- 21.2 kly
- Distance from Galactic Center:
- 5.5 kly
- Apparent Diameter:
- 1.3 arc min
- 11.00 mag vis
- Radial Velocity:
- +/- km/s
- Abs. Mag:
- -4.19 Mag vis
AL3 (Andrews-Lindsay 3) was discovered in 1967 by
Andrews and Lindsay (1967); it was later cataloged
by Van den Bergh and Hagen (1975) as BH 261 or
vdB-Ha 261, and as ESO 456-SC78 by
Lauberts et.al. (1982).
While all these authors listed it as a faint open cluster candidate,
investigations by Ortholani et.al. (2006)
have revealed its nature as a globular cluster by means of spectrophotometric
observations, i.e. photometry in B, V, and I band of the spectrum, and
Color-Magnitude Diagram. That diagram resembles that of globular cluster
M5 and exhibits a prominent blue extended Horizontal
Branch. These observations were performed at ESO (La Silla)
- A.D. Andrews and E.M. Lindsay, 1967.
Irish Astronomical Journal, Vol. 8, pp. 126-127.
- Lauberts et.al., 1982.
ESO/Uppsala Survey of ESO(B) Atlas, ESO, Garching.
- S. Ortolani, E. Bica and B. Barbuy, 2006.
AL 3 (BH 261): a new globular cluster in the Galaxy.
To appear in: Astrophysical Journal Letters.
- Sidney van den Bergh and Gretchen L. Hagen, 1975.
Uniform survey of clusters in the Southern Milky Way.
Astronomical Journal, Vol. 80, No. 1, p. 11-16 (Jan 1975)
[MW Globulars] |